improvements to the triaging process

I propose to create additional labels in the triaging process for pmaports.

While we have labels for the devices, the release, the soc and the issue-status, looking at many issues I noticed, it might be also good to have a possibility to classify by sub-system.

This could be:

audio
camera
network-lan (for eth & wlan)
mobile-data
bluetooth
display
storage
filesystems (incl. zram)
init
bootloader
3d-accel

Above list is just an example, but I think having another level of classification would help grouping issues.

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